Test Values/Wear Limits For C2/C2S And C4/C4S - PCCB Brakes (Option)
Information
The following condition criteria can make replacement necessary depending on the wear of the PCCB brake discs:
- Surface changes in the brake disc friction surfaces at an advanced stage.
- Minimum brake disc thickness is not retained due to wear (material erosion due to friction).
| Location | Description | Type | Basic value | Tolerance 1 | Tolerance 2 |
|---|---|---|---|---|---|
| Pad thickness, front | Measured value | approx. 12.0 mm | |||
| Pad thickness, front (wear limit) | Measured value | 2 mm | |||
| Pad thickness, rear | Measured value | approx. 12.0 mm | |||
| Pad thickness, rear (wear limit) | Measured value | 2 mm | |||
| Brake disc thickness, new (front) | Measured value | 34 mm | |||
| Brake disc thickness, new (rear) | Measured value | 28 mm | |||
| Brake disc wear limit, front | Minimum brake disc thickness (wear limit) is stamped on the brake-disc chamber. Example: Min. Th. 33.7 mm | Measured value | mm (Readvalueonbrake-discchamber)X.XX | ||
| Brake disc wear limit, rear | Minimum brake disc thickness (wear limit) is stamped on the brake-disc chamber. Example: Min. Th. 27.7 mm | Measured value | mm (Readvalueonbrake-discchamber)X.XX | ||
| Wear limit: Surface changes in front and rear brake discs | Wear limit: Connected surface fracture > 1 cm2 and/or surface roughness of brake disc > 80 micrometer. Replace PCCB brake discs on each axle. | Surface changes | Values and procedure for: checking front 46 51 02 PCCB brake discs/checking rear 46 54 02 PCCB brake discs. | ||
| Thickness tolerance of brake discs (max.) | Measured value | 0.02mm | |||
| Lateral runout of brake disc (max.) | Measured value | 0.03mm | |||
| Lateral runout of wheel hub (max.) | Measured value | 0.03mm | |||
| Lateral runout of brake disc when installed (max.) | Measured value | 0.06mm | |||
| Push-rod play | Measured at brake pedal plate | Measured value | approx. 1mm | ||
| Diameter of parking-brake drum | Parking brake/hand brake (drum brake acting mechanically on both rear wheels) | Diameter | 180mm | ||
| Diameter of parking-brake drum, wear limit | Diameter | 181mm | |||
| Width of parking-brake shoe | Measured value | 25mm | |||
| Thickness of parking-brake pad | Measured value | 4.5mm | |||
| Thickness of parking-brake pad, wear limit | Measured value | 2mm |